Zong Hongxiang, Wu Haijun, Tao Xuefei, Xue Deqing, Sun Jun, Pennycook Stephen J, Min Tai, Zhang Zhenyu, Ding Xiangdong
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.
Department of Materials Science and Engineering, National University of Singapore, 117574 Singapore.
Phys Rev Lett. 2019 Jul 3;123(1):015701. doi: 10.1103/PhysRevLett.123.015701.
Strain glass is being established as a conceptually new state of matter in highly doped alloys, yet the understanding of its microscopic formation mechanism remains elusive. Here, we use a combined numerical and experimental approach to establish, for the first time, that the formation of strain glasses actually proceeds via the gradual percolation of strain clusters, namely, localized strain clusters that expand to reach the percolating state. Furthermore, our simulation studies of a wide variety of specific materials systems unambiguously reveal the existence of distinct scaling properties and universal behavior in the physical observables characterizing the glass transition, as obeyed by many existing experimental findings. The present work effectively enriches our understanding of the underlying physical principles governing glassy disordered materials.
应变玻璃正在被确立为高掺杂合金中一种概念上新的物质状态，然而对其微观形成机制的理解仍然难以捉摸。在这里，我们首次使用数值与实验相结合的方法来确定，应变玻璃的形成实际上是通过应变团簇的逐渐渗流过程实现的，即局部应变团簇扩展至达到渗流状态。此外，我们对多种特定材料体系的模拟研究明确揭示，在表征玻璃转变的物理可观测量中存在独特的标度性质和普遍行为，这与许多现有实验结果相符。当前的工作有效地丰富了我们对玻璃态无序材料潜在物理原理的理解。
